Porous anodes with helical flow pathways in bioelectrochemical systems: The effects of fluid dynamics and operating regimes

Research output: Contribution to journalArticle

Authors

  • Jung Rae Kim
  • Negar Amini
  • Kondo François Aguey-Zinsou
  • Iain Michie
  • Richard M. Dinsdale
  • Alan J. Guwy
  • Zheng Xiao Guo
  • Giuliano C. Premier

Colleges, School and Institutes

External organisations

  • University of Glamorgan
  • UCL
  • University of New South Wales (UNSW) Australia

Abstract

Bioelectrochemical systems (BES) and/or microbial fuel cell (MFC) mass transport and associated over-potential limitations are affected by flow regimes, which may simultaneously increase the power and pollution treatment capacities. Two electrodes with helical flow channels were compared in the same tubular MFC reactor. 1). A machined monolithic microporous conductive carbon (MMCC). 2). A layered carbon veil with spoked ABS former (LVSF); both presented helical flow channel. Anode performances were compared when subject to temperature, substrate concentration and flow rate variations. The MMCC maximum power increased from 2.9 ± 0.3 to 7.6 ± 0.7 mW with influent acetate concentration, from 1 to 10 mM (with 2 mL min -1), but decreased power to 5.5 ± 0.5 mW at 40 mM, implicated localized pH/buffering. Flow rate (0.1 to 7.5 mL min -1) effects were relatively small but an increase was evident from batch to continuous operation at 0.1 mL min -1. The LVSF configuration showed improved performance in power as the flow rate increased, indicating that flow pattern affects BES performance. Computational fluid dynamics (CFD) modelling showed less uniform flow with the LVSF. Thus flow regime driven mass transfer improves the power output in continuously fed system operation. These results indicate that electrode configuration, flow regime and operating condition need consideration to optimize the bioelectrochemical reaction.

Details

Original languageEnglish
Pages (from-to)382-390
Number of pages9
JournalJournal of Power Sources
Volume213
Publication statusPublished - 1 Sep 2012

Keywords

  • Bioelectrochemical system (BES), Carbon foam, Flow induced mass transfer, Helical electrode, Micro-porous carbon, Microbial fuel cell (MFC)